It seems that IT3.7 (Lite) has some problems to display the list of generators and related UI (10.7.5):

As you can see, when switching from another tab (here, the Filters one), the generators list isn't displayed and some parts of the previous UI remain on top of the generator UI (here, the "Largeur" (Width) slider comes from the CMYK Halftone filter).
An easy workaround is to hide IT then to re-select it as the "active" application.
Last news: IT Pro 3.7 has the same bug.